At idle the rpm's surge to about 2000 then back to 1100 at the same time boost is surging with the idle... its not getting into the positives but still enough. Now this doesn't happen all the time, and its inconstant from when it happens; start up, after being ran, at stops... then will just go away. searched a bit but not sure if theyre having the same symptoms. NOTE* the car is running a speed density setup.